Quick Release Collars for Barbell Bars 50/51 mmThe Quick Release Barbell Clamps 50 51 mm in Detail The temptation is great especially when training is particularly intense. Nevertheless, you should always secure your weights to the bar with the right fastener. This will help you to avoid absolute imbalance if weights on a bar come off unintentionally. Key Features about our Olimpic Barbell Clamps: For securing weight discs on barbell bars with a 50 51 mm (2") mount Colour: black red Material: